medical experts say that's part of the reasons the c-section rate has skyrocketed in the u.s. until the past 40 years it's gone from 5% in 1970 to more than 31% in 2007. some doctors have had legitimate concerns about vbac because there can be complications. >> the major risk of a vbac is the uterus rupturing. that happens in about 1% of the time. >> reporter: women who have had big babies or diabetic might require another ceasarean. they also might need one if they go past their due dates because it's too risky to induce. >> in the end we just want a healthy baby. >> reporter: however the newborn is delivered. -- stand sandra hughes, cbs news, los angeles. ,,,, "know the species, know the stain." lanolin-free coat, i know it's an alpaca. walks in here, looks says "hey look, it's a llama!" cleaning the stain like he would a llama stain. time he's wasting. ♪ call 1-800-steemer ,,,, we're working on for eyewitness news at 6. >>> i'm dana king. here's what we're working on for eyewitness news at 6:00. oakland moves ahead with plans for a megapot farm. industrial sized, if you w